Larry was daydreaming the day that his first grade teacher reviewed the math lesson that 5 + 5 = 10. later, larry was not able to recall this information, probably because

Larry could not recall the 5+5=10 lesson because he was preoccupied with daydreaming. When you are not focused fully on learning a new subject it can be difficult to retain the information. The brain is tremendous at storing information but you have to be engaged to access it.